POLYZOA. 265 



then residing at Lamlash, it was shown to him, who kindly 

 took a drawing of it and sent it to Dr. Johnston, who has 

 given it a place in his ' History/ as fig. 86, p. 476. Soon 

 after, Mr. Alder discovered that it had been figured and 

 described by Sars, in his ' Fauna of Norway/ as Lucernaria 

 cyatldfornds. Its form greatly resembles some of our old 

 silver communion-cups, with a fringe round its mouth. In 

 its structure and substance it is like the other LucernarifS. 

 " The tentacles are arranged in eight tufts round the in- 

 terior of the disc ; and they are extended beyond it, when 

 the animal is alive." It would appear that it is not very 

 rare in the island of Arran, for I got it afterwards on the 

 east side of the island, in a rock-pool at Corrigils. 



CLASS II. POLYZOA. 



The Polyzoa are divisible into two orders : 

 I. INFUNDIBULATA. Natives of the sea. Polypes com- 

 pound; the mouth surrounded with ciliated filiform re- 

 tractile tentacula, which form an uninterrupted circle: 

 ova ciliated. 



